A decoloring premixing tank for oil processing and a method of using the same

Abstract

This invention relates to the field of oil decolorization technology, specifically to an oil processing decolorization premixing tank and its usage method. The premixing tank includes a tank body, a mixing inlet device, a driving stirring mechanism, a dust collection device, and an overflow discharge structure. The mixing inlet device employs an inner and outer cylinder structure, allowing the adsorbent and oil to form a premixed slurry upon entering the tank body. The dust collection device is positioned between the vacuum interface and the vacuum system, forming an oil film through spray nozzles and a collection disc to wash and collect the airflow carrying adsorbent dust. The driving stirring mechanism, in conjunction with baffles, ensures the adsorbent is uniformly suspended in the oil. The overflow discharge structure is used for discharging the material. This invention effectively reduces the amount of adsorbent dust entering the vacuum system, prevents adsorbent agglomeration and excessive breakage, and improves the uniformity of oil premixing and the stability of subsequent decolorization.

Description

Technical Field

[0001] This invention relates to the field of oil decolorization technology, specifically to an oil processing decolorization premixing tank and its usage method. Background Technology

[0002] Crude vegetable and animal oils such as soybean oil, rapeseed oil, and animal fats must be refined to remove harmful impurities such as pigments and gums before they can meet the first-grade edible oil standard. Adsorption decolorization is the core process of oil refining. Powdered adsorbents such as activated clay, activated carbon, and diatomaceous earth are typically used. These adsorbents are mixed with the oil under vacuum (residual pressure 3-5 kPa) and high temperature (90-120℃) conditions to physically adsorb and remove pigment components such as chlorophyll and carotenoids from the crude oil. A vacuum environment is a key requirement for the decolorization process: firstly, it removes air from the surface of the adsorbent, maximizing the activation of adsorption sites; secondly, it isolates oxygen, preventing oxidation and deterioration of the oil at high temperatures and shortening the decolorization reaction time. Therefore, in actual production, it is usually necessary to premix the adsorbent with the oil under vacuum before proceeding to the subsequent decolorization process.

[0003] In existing technologies, the negative pressure created by the vacuum pump in the decolorization system is generally used to draw powdered adsorbent into a premixing tank and mix it with grease. For example, patent CN202666765U discloses a vacuum clay premixer, which solves part of the problem of clay splashing and clogging the vacuum port by setting a baffle plate inside the tank to block the clay from the vacuum port, setting an oil cover by setting an oil leakage hole around the clay feed pipe of the grease inlet pipe, and adding an overflow baffle to extend the mixing time. However, this device only passively blocks dust with the baffle plate and does not have an active dust collection structure, so the problem of dust escape is not completely solved; and there is no precise speed control mechanical stirring design, which can easily cause uneven mixing or breakage of the adsorbent.

[0004] In summary, existing premixing equipment and processes still have significant shortcomings: First, dust escape and pollution are serious: when powdered adsorbents are drawn in under negative pressure, a large amount of dust escapes with the airflow and directly enters the decolorization tower and vacuum system, causing blockages and pollution in the condenser, vacuum pump, and water circulation system. This not only leads to adsorbent loss and waste but also damages vacuum equipment and poses a risk of production shutdown. Second, the mixing uniformity between adsorbent and oil is poor: mainly due to unreasonable equipment stirring parameters and structural design, the adsorbent is prone to sedimentation and clumping, resulting in insufficient contact with the oil, directly reducing decolorization efficiency and causing the oil's color and transparency to fail to meet standards. Third, oil is prone to oxidation: improper stirring structure can trap air, accelerating oil oxidation and rancidity at high temperatures, affecting the stability and flavor of the oil. Therefore, developing a decolorization premixing tank that can efficiently capture adsorbent dust, achieve uniform mixing of oil and adsorbent, and protect the vacuum system is a technical problem that urgently needs to be solved in the oil refining industry. Summary of the Invention

[0005] To address the technical problems in existing technologies, such as adsorbent dust escape, uneven mixing, easy contamination of the vacuum system, and poor oil decolorization effect, this invention provides a premixing tank for decolorization in oil processing and its usage method, achieving zero dust escape, efficient and uniform mixing, low adsorbent loss, and long-term stable operation of the vacuum system, significantly reducing adsorbent consumption and production labor intensity, and significantly improving the quality of finished oil products.

[0006] The technical solution of this invention is as follows: In a first aspect, the present invention provides a premixing tank for decolorizing oil processing, comprising a tank body, a mixing inlet device disposed on the upper part of the tank body, a driving stirring mechanism disposed inside the tank body, a dust collection device connected to the vacuum interface of the tank body, and an overflow discharge structure connected to the liquid outlet end of the tank body. The tank is a vertical cylindrical shape, and includes a cylindrical body and end caps disposed at the upper and lower ends of the cylindrical body; a baffle is also provided on the inner wall of the cylindrical body; The mixing inlet device includes an inner cylinder for introducing the adsorbent and an outer cylinder for introducing the grease. The inner cylinder is disposed inside the outer cylinder so that the adsorbent and grease form a premixed slurry flow when entering the tank. The dust collection device is located between the vacuum interface and the vacuum system. The dust collection device includes a spray nozzle and a collection disc. Grease enters the dust collection device through the spray nozzle and comes into full contact with the air carrying dust through the disc, washing and purifying the dust. Only the purified clean gas can enter the vacuum system. The driving and stirring mechanism includes a power unit and a stirring mechanism disposed inside the tank; the driving and stirring mechanism cooperates with a baffle disposed on the inner wall of the tank to make the adsorbent uniformly suspended in the oil without agglomeration and clumping. The overflow discharge structure includes an overflow pipe and an oil outlet, which are used to transport the evenly mixed slurry to the next process.

[0007] Furthermore, the tank also includes a level gauge interface at the bottom of the tank, a ladder inside the tank, an ear-type support at the middle of the outer side of the tank, a manhole sight glass at the top of the tank, and a drain port at the bottom of the tank. The level gauge interface, manhole sight glass, and drain port facilitate real-time monitoring and maintenance of the internal liquid level, operating status, and residue discharge. The ladder and ear-type support facilitate internal maintenance and cleaning, as well as overall machine support and fixation, thereby improving the maintainability, safety, and ease of use of the equipment.

[0008] Furthermore, the ratio of the diameter to the height of the tank is 2:1, and the outer shell of the tank is made of SS304 stainless steel.

[0009] Furthermore, the stirring impeller of the stirring mechanism is a turbine type, the speed ratio of the reducer of the stirring mechanism is 12, and the stirring speed is 115 r / min. By using a turbine stirrer and controlling the speed ratio and stirring speed at the above values, a strong axial circulating flow can be formed, which can fully suspend the adsorbent in the oil and enhance the mass transfer efficiency. At the same time, it avoids adsorbent particle breakage, subsequent filtration difficulties, and increased loss of neutral oil due to excessive stirring, thus balancing the uniformity of mixing and the integrity of the adsorbent.

[0010] Furthermore, the baffle is a wall-mounted structure, and its lower end is below the weld line between the lower end cap and the cylinder body. This is used to eliminate the swirling zone and vortex phenomenon, and to suppress adsorbent adhesion and agglomeration on the wall. By setting the wall-mounted baffle, the vortex flow inside the tank can be effectively disrupted, the material's up-and-down tumbling and overall circulation can be enhanced, and the deposition, adhesion, and agglomeration of adsorbent on the wall surface can be reduced. This improves the mixing uniformity of oil and adsorbent, enhances the decolorization effect, and reduces the difficulty of cleaning and maintenance.

[0011] Furthermore, the length of the outer cylinder is 3-4 times the length of the inner cylinder, and the outlet of the outer cylinder is 5mm lower than the oil outlet. By setting the above-mentioned inner and outer cylinder structure and their dimensional relationship, the adsorbent can be quickly wetted by the grease and form a preliminary slurry before entering the machine body, while reducing the adsorbent from flying and clumping at the inlet, thereby preventing the adsorbent from being directly carried away by the vacuum airflow, reducing the subsequent stirring load, and improving the premixing efficiency.

[0012] Furthermore, the collecting discs include disc A and disc B. After oil is introduced through the spray nozzle, a continuous descending oil film is formed on disc A and disc B. The vacuum airflow carrying adsorbent dust is washed by the oil film and then discharged through the vacuum interface. The multi-stage oil film washing path formed by discs A and B ensures that the airflow carrying dust comes into full counter-current contact with the oil film, thereby effectively capturing adsorbent dust such as bleaching clay and activated carbon. This effectively reduces the amount of dust entering the vacuum condenser and water ring vacuum pump, thus protecting the vacuum system and reducing the probability of contamination and blockage.

[0013] Furthermore, the overflow pipe has a T-shaped structure, and a dust cap is provided at the top of the overflow pipe. By adopting a T-shaped overflow pipe structure, the liquid level and material residence time can be stably controlled during equipment operation, preventing insufficiently mixed grease from being discharged prematurely; by setting a dust cap, the adsorbent can be prevented from entering the overflow channel, further ensuring the stability of the discharge and the continuous operation of subsequent processes.

[0014] Secondly, the present invention provides a method of using a premixing tank for decolorizing oil processing, comprising the following steps: S1. Start the adsorbent delivery system and deliver the adsorbent to the adsorbent storage tank for later use via the adsorbent feeder; S2. Start the vacuum system to make the vacuum condenser and water ring vacuum pump work, and maintain the residual pressure in the tank at 3-5 kPa. S3. Start the oil inlet pump so that the oil to be decolorized is heated by the heater and then quantitatively fed into the tank through the heater outlet; S4. After the grease enters the machine body, start the power unit and stirring mechanism, and add adsorbent into the inner cylinder through the adsorbent metering device. S5. The heated input grease is divided into two paths. One path enters the mixing inlet device through the oil inlet and forms a premixed slurry with the adsorbent before entering the tank. The other path enters the dust collection device through the spray nozzle to form a descending oil film to collect adsorbent dust in the vacuum airflow. S6. After the liquid level in the tank reaches the overflow position, the well-mixed slurry is transported to the next process through the overflow pipe and the oil outlet.

[0015] By adopting the above-mentioned method, a stable vacuum environment is first established, followed by heating and oil injection, quantitative powder addition, premixing, and in-tank enhanced mixing. Simultaneously, the dust in the vacuum gas flow is washed and captured by spraying oil film, so that the adsorbent and oil can quickly form a uniform slurry under controlled conditions. This not only improves the premixing quality and decolorization pretreatment efficiency, but also significantly reduces dust loss and vacuum system contamination, ensuring continuous and stable operation of the system.

[0016] Furthermore, in step S4, the amount of adsorbent added is 0.5% to 2% of the weight of the oil; in step S5, the amount of oil entering the mixing inlet device through the oil inlet accounts for 80% of the total oil intake, and the amount of oil entering the dust collection device through the spray nozzle accounts for 20% of the total oil intake; when shutting down, the following sequence is followed: first, turn off the adsorbent metering device, then turn off the water ring vacuum pump, and then stop the oil intake and discharge the turbid oil through the vent.

[0017] The beneficial effects of this invention are as follows: (1) By setting an inner cylinder and an outer cylinder in the mixing inlet device, and setting the inner cylinder inside the outer cylinder and extending the outer cylinder downward to below the liquid surface inside the machine body, the present invention solves the problems of adsorbent being easy to fly away, easy to clump, and insufficient contact with oil when entering the tank. It has the ability to make the adsorbent and oil form a premixed slurry flow when entering the tank and improve the premixing uniformity.

[0018] (2) By setting a dust collection device with a spray nozzle and a collection disc between the vacuum interface and the vacuum system, the present invention solves the problem of adsorbent dust entering the vacuum system with the vacuum airflow and causing pollution and blockage of the condenser and water ring vacuum pump. It has the functions of washing and collecting the airflow carrying adsorbent dust, reducing adsorbent loss and protecting the continuous and stable operation of the vacuum system.

[0019] (3) By cooperating the power device and stirring mechanism in the driving stirring mechanism with the baffle set on the inner wall of the machine, the present invention solves the problems of adsorbent sedimentation, wall hanging, agglomeration and excessive breakage of adsorbent due to excessive stirring in the existing premixing process. It has the beneficial effects of making the adsorbent uniformly suspended in the oil, enhancing mass transfer and taking into account the integrity of adsorbent particles.

[0020] (4) By adopting an overflow discharge structure consisting of an overflow pipe and an oil outlet, the present invention solves the short-circuit problems of large fluctuations in liquid level in the tank, unstable material residence time, and premature discharge of unmixed slurry. It has the beneficial effects of maintaining a constant liquid level, ensuring that the slurry has relatively stable residence and mixing conditions in the tank, and smoothly transporting it to the next process.

[0021] (5) This invention integrates the tank, mixing inlet device, driving stirring mechanism, dust collection device and overflow discharge structure into an integrated structure, which solves the problem of dust collection in the process of mixing oil and adsorbent. It can effectively avoid the loss in the adsorbent addition process, protect the vacuum system from dust pollution, and promote the uniform and efficient mixing of oil and adsorbent in the tank. At the same time, it can optimize equipment cost, significantly reduce adsorbent consumption and production labor intensity, significantly improve the quality of finished oil, and promote the technological upgrading of oil refining process equipment. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the oil processing decolorization premixing tank of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the mixing inlet device of the present invention.

[0025] Figure 3 This is a schematic diagram of the dust collection device of the present invention.

[0026] Figure 4 This is a schematic diagram of the structure of the baffle of the present invention.

[0027] Figure 5 This is a process flow diagram of the premixing tank of the present invention.

[0028] In the diagram, 1-head; 2-cylinder; 3-level gauge interface; 4-ladder; 5-ear support; 6-manhole sight glass; 7-oil inlet; 8-mixing inlet device; 9-adsorbent inlet; 10-power unit; 11-vacuum interface; 12-spray nozzle; 13-dust collection device; 14-dust cap; 15-overflow pipe; 16-oil outlet; 17-baffle; 18-stirring mechanism; 19-vertical shaft assembly device; 20-drain port; 21-disassembly flange; 22-inner cylinder; 23-outer cylinder; 24-connecting steel bar; 25-disassembly flange; 26-outer cylinder; 27-disc A; 28-disc B; 29-adsorbent feeder; 30-adsorbent storage tank; 31-fan; 32-adsorbent metering device; 33-vacuum condenser; 34-water ring vacuum pump; 35-heater. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0030] like Figures 1-5 As shown, the present invention provides a premixing tank for decolorizing oil processing, comprising a tank body, a mixing inlet device 8 disposed on the upper part of the tank body, a driving stirring mechanism disposed inside the tank body, a dust collection device 13 connected to a vacuum interface 11 of the machine body, and an overflow discharge structure connected to the liquid outlet end of the tank body. The tank body is a vertical cylindrical tank body, comprising a cylinder 2 and end caps 1 disposed at the upper and lower ends of the cylinder 2, and a baffle 17 disposed on the inner wall of the cylinder. The tank body also includes a level gauge interface 3 disposed at the bottom of the cylinder 2, a ladder 4 disposed inside the cylinder 2, an ear-type support 5 disposed in the middle of the outer side of the cylinder 2, a manhole sight glass 6 disposed on the upper side of the cylinder 2, and an vent 20 disposed at the bottom of the cylinder 2. The level gauge interface 3 is used to monitor the liquid level inside the equipment in real time; the ladder 4 is used for cleaning and maintenance inside the equipment; the ear-type support 5 is used for supporting and fixing the equipment; the manhole sight glass 6 is used to observe the internal operating status of the equipment and facilitate personnel maintenance; and the vent 20 is used to drain the residual turbid oil inside the machine after shutdown.

[0031] The tank body adopts a vacuum container structure design with an external reinforcing ring to withstand the vacuum pressure. The height-to-diameter ratio (H / D) of the tank body is 2:1, the design temperature is 120-150℃, and the main body material is SS304. This structural design allows for sufficient residence and reaction time of the grease and adsorbent within the container, while meeting the strength and corrosion resistance requirements under high temperature and vacuum conditions.

[0032] In this embodiment, the mixing inlet device 8 is located at the top of the tank and connected to the adsorbent metering device 32. The mixing inlet device 8 includes an oil inlet 7, an adsorbent inlet 9, a disassembly flange 21, an inner cylinder 22, and an outer cylinder 23. The adsorbent inlet 9 communicates with the inner cylinder 22, and the oil inlet 7 communicates with the outer cylinder 23. The inner cylinder 22 is located inside the outer cylinder 23. The length of the outer cylinder 23 is 3 to 4 times the length of the inner cylinder 22. After the adsorbent is introduced through the inner cylinder 22, it forms a preliminary mixed slurry with the grease in the outer cylinder 23 and enters the interior of the tank 2. Because the outer cylinder 23 is 5 mm below the oil outlet 16, it effectively reduces adsorbent scattering, prevents backflow contamination of the oil inlet 7, and helps prevent adsorbent agglomeration and improves premixing efficiency.

[0033] In this embodiment, the driving stirring mechanism includes a power unit 10, a vertical shaft assembly device 19, and a stirring mechanism 18 disposed on the vertical shaft assembly device 19. The stirring mechanism 18 is a turbine stirrer with a reducer speed ratio of 12 and a stirring speed of 115 r / min. By using a turbine stirrer with the above parameters, a strong axial circulating flow can be formed inside the cylinder 2, so that the adsorbent is fully suspended and evenly dispersed in the grease, while avoiding the breakage of adsorbent particles due to excessive stirring.

[0034] In this embodiment, a baffle 17 is provided on the inner wall of the cylinder 2, and the baffle 17 is used in conjunction with the driving stirring mechanism. The baffle 17 consists of three vertical baffles evenly arranged along the circumference of the inner wall of the cylinder 2. Each baffle 17 is a wall-mounted structure, and the lower end of each baffle 17 is lower than the weld line between the lower end cap and the cylinder 2. By setting the baffle 17, the liquid vortex zone and swirling phenomenon inside the tank can be effectively eliminated, the adsorbent can be inhibited from adhering to the wall and agglomerating, and the uniformity of material mixing can be improved.

[0035] In this embodiment, the dust collection device 13 is positioned between the vacuum interface 11 and the vacuum system. The dust collection device 13 includes the vacuum interface 11, a spray nozzle 12, a disassembly flange 25, an outer cylinder 26, connecting steel bars 24, and collection discs, including disc A27 and disc B28. The connecting steel bars 24 are used to fix disc A27 and disc B28 to prevent displacement. After the grease enters the outer cylinder 26 through the spray nozzle 12, it first overflows on disc A27 and forms a downward-flowing oil film, which is then received by disc B28 and continues to form a descending oil film. The vacuum gas flow discharged from inside the tank repeatedly penetrates and contacts this oil film in reverse, and the adsorbent dust entrained is washed and collected by the oil film during this process. The clean gas then enters the vacuum system through the vacuum interface 11. This dust collection device 13 effectively prevents adsorbent dust such as bleaching clay and activated carbon from entering the vacuum condenser 33 and the water ring vacuum pump 34.

[0036] In this embodiment, the overflow discharge structure includes an overflow pipe 15 disposed at the lower part of the tank and an oil outlet 16 communicating with the overflow pipe 15. The overflow pipe 15 has a T-shaped structure, and a dust cap 14 is provided on the top of the overflow pipe 15. The overflow pipe 15 is used to control the liquid level inside the tank to maintain a relatively constant state, so that the uniformly mixed slurry flows upward from the bottom of the tank through the overflow pipe 15 and is discharged from the oil outlet 16. This can prevent the grease from short-circuiting and flowing out prematurely, and also prevent the adsorbent from entering the overflow pipe 15.

[0037] In this embodiment, the usage process of the above-mentioned oil processing decolorization premixing tank is as follows: Start the air blower 31, adjust the air pressure and air volume of the blower 31 through the motor frequency converter or pipeline valve, start the adsorbent conveying system, and transport the adsorbent to the adsorbent storage tank 30 for standby through the adsorbent feeder 29. Set the required amount of adsorbent to be added through the adsorbent metering device 32. The amount added is 0.5% to 2% of the oil weight. In actual production, a little more can be added when the oil to be decolorized is first added, and the amount can be reduced according to the condition of the filtered oil.

[0038] Turn on the vacuum system, start the water ring vacuum pump 34, and circulate water in the vacuum condenser 33 to maintain the residual pressure in the tank at 3-5 kPa. After the oil enters the tank, turn on the agitator 18 of the clay premixer. The agitator has three pairs of folding blade turbine agitators, and the agitator shaft is fixed by bearings at both ends.

[0039] Start the oil inlet pump and heat the quantitatively delivered oil to be decolorized to 95~105℃ through the plate steam heater 35. Then pump it into the tank. Adjust the branch oil inlet valves and the oil inlet distribution ratio of oil inlet 7 and spray outlet 12 to 4:1. This can effectively form an adsorbent slurry flow and fully wash the adsorbent dust in the vacuum airflow.

[0040] When the adsorbent metering device 32 is started, the adsorbent is automatically added in a metered proportion into the inner cylinder 22. The oil pumped in through the oil inlet 7 forms a swirling flow, mixes with the adsorbent in the inner cylinder 22, and enters the outer cylinder 23. After the adsorbent and oil in the outer cylinder 23 are initially mixed, they form a slurry flow that enters the equipment. The outer cylinder 23 extends slightly into the working liquid surface, which can effectively prevent dust.

[0041] The oil slurry entering the cylinder 2 (the equipment's interior) is rapidly and thoroughly mixed under the powerful stirring action of the power unit 10 and the folding turbine agitator 18. To eliminate liquid vortexing and swirling phenomena, three baffles 17 are radially and evenly installed inside the cylinder 2. To prevent the adsorbent from being pushed and adhered, the baffles 17 are designed to be installed away from the wall, with the upper end of the baffle 17 flush with the static liquid surface and the lower end slightly below the weld line between the lower end cap and the cylinder 2. The agitator 18 operates at a fixed speed of 115 r / min, ensuring that the clay is completely and evenly suspended in the oil, forming a stable slurry without generating excessive shear force. The oil and clay mixture exhibits a uniform and vigorous up-and-down turbulent circulation, but without sharp eddies or large amounts of air being entrained.

[0042] After the oil enters the premixer, the liquid level and temperature are observed through the manhole sight glass 6. Once the liquid level exceeds the overflow position, the slurry flow at the bottom of the equipment flows upward through the built-in overflow pipe 15 and flows out from the oil outlet 16 to the next process (filter or decolorization tower). The vacuum airflow carrying a small amount of adsorbent dust passes through discs A27 and B28, repeatedly penetrating and contacting the vegetable oil film introduced from the spray nozzle 12 in a counter-current manner. During this process, the adsorbent dust is effectively captured, and the clean vacuum airflow enters the vacuum condenser 33 through the vacuum interface 11. The cooled airflow is extracted by the water ring vacuum pump 34, and the water entrained in the vacuum airflow is discharged as wastewater after cooling.

[0043] When shutting down, first turn off the adsorbent metering device 32, then turn off the water ring vacuum pump 34, then stop the oil inlet, open the bottom drain valve, and drain all the turbid oil inside the tank into the turbid oil tank.

[0044] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be covered within the protection scope of the present invention.

Claims

1. A premixing tank for decolorizing oils and fats, characterized in that, It includes a tank body, a mixing inlet device (8) located on the upper part of the tank body, a driving stirring mechanism located inside the tank body, a dust collection device (13) connected to the vacuum interface (11) of the tank body, and an overflow discharge structure connected to the liquid outlet end of the tank body; The tank is a vertical cylindrical shape, and the tank includes a cylinder (2) and end caps (1) provided at the upper and lower ends of the cylinder (2); the inner wall of the cylinder (2) is also provided with baffles (17). The mixing inlet device (8) includes an inner cylinder (22) for introducing an adsorbent and an outer cylinder (23) for introducing grease, wherein the inner cylinder (22) is disposed inside the outer cylinder (23); The dust collection device (13) is located between the vacuum interface (11) and the vacuum system. The dust collection device (13) includes a spray nozzle (12) and a collection disc. The driving stirring mechanism includes a power unit (10) and a stirring mechanism (18) disposed in the tank body. The overflow discharge structure includes an overflow pipe (15) and an oil outlet (16).

2. The oil processing decolorization premixing tank as described in claim 1, characterized in that, The tank also includes a level gauge interface (3) at the bottom of the cylinder (2), a ladder (4) inside the cylinder (2), an ear support (5) at the middle of the outer side of the cylinder (2), a manhole sight glass (6) at the top of the cylinder (2), and an vent (20) at the bottom of the cylinder (2).

3. The premixing tank for decolorizing oil processing as described in claim 2, characterized in that, The ratio of the diameter to the height of the tank is 2:1, and the outer shell of the tank is made of SS304 stainless steel.

4. The oil processing decolorization premixing tank as described in claim 1, characterized in that, The stirring mechanism (18) has a turbine-type stirring blade, and the speed ratio of the reducer of the stirring mechanism (18) is 12, with a stirring speed of 115 r / min.

5. The premixing tank for decolorizing oil processing as described in claim 1, characterized in that, The baffle (17) is a wall-mounted structure, and the lower end of the baffle (17) is lower than the weld line between the lower end cap and the cylinder (2).

6. The oil processing decolorization premixing tank as described in claim 1, characterized in that, The length of the outer cylinder (23) is 3-4 times the length of the inner cylinder (22), and the outlet of the outer cylinder (23) is 5mm lower than the oil outlet (16).

7. The oil processing decolorization premixing tank as described in claim 1, characterized in that, The collection discs include disc A (27) and disc B (28). After grease is introduced into the spray nozzle (12), a continuous descending oil film is formed on disc A (27) and disc B (28). The vacuum airflow carrying adsorbent dust is washed by the oil film and discharged through the vacuum interface (11).

8. The premixing tank for decolorizing oil processing as described in claim 1, characterized in that, The overflow pipe (15) has a T-shaped structure, and a dust cap (14) is provided on the top of the overflow pipe (15).

9. A method of using the oil processing decolorizing premixing tank as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Start the adsorbent delivery system and deliver the adsorbent to the adsorbent storage tank (30) via the adsorbent feeder (29) for standby. S2. Start the vacuum system to make the vacuum condenser (33) and water ring vacuum pump (34) work, and maintain the residual pressure in the tank at 3-5 kPa; S3. Start the oil pump so that the oil to be decolorized is heated by the heater (35) and then quantitatively fed into the tank through the oil outlet of the heater; S4. After the oil enters the tank, start the power unit (10) and the stirring mechanism (18), and add adsorbent to the inner cylinder (22) through the adsorbent metering device (32); S5. The heated input grease is divided into two paths. One path enters the mixing inlet device (8) through the oil inlet (7) and forms a premixed slurry flow with the adsorbent before entering the tank. The other path enters the dust collection device (13) through the spray nozzle (12) to form a descending oil film to collect the adsorbent dust in the vacuum airflow. S6. After the liquid level in the machine body reaches the overflow position, the well-mixed slurry is transported to the next process through the overflow pipe (15) and the oil outlet (16).

10. The method of use as described in claim 9, characterized in that, In step S4, the amount of adsorbent added is 0.5% to 2% of the weight of the oil; in step S5, the amount of oil entering the mixing inlet device (8) through the oil inlet (7) accounts for 80% of the total oil intake, and the amount of oil entering the dust collection device (13) through the spray port (12) accounts for 20% of the total oil intake; when shutting down, the following sequence is followed: first, turn off the adsorbent metering device (32), then turn off the water ring vacuum pump (34), then stop the oil intake and discharge the turbid oil through the vent (20).

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